Feat: 배열, 연결 리스트, 스택, 큐 2문제

Author: ienrum

1주차/채수혁/레벨1__올바른_괄호.js

@@ -0,0 +1,35 @@
+class Stack {
+  constructor() {
+    this.arr = [];
+    this.index = -1;
+  }
+
+  push(item) {
+    this.arr[++this.index] = item;
+  }
+
+  pop() {
+    const temp = this.arr[this.index--];
+    return temp;
+  }
+
+  top() {
+    return this.arr[this.index];
+  }
+}
+
+function solution(s) {
+  var answer = true;
+
+  const stack = new Stack();
+
+  for (const char of s.split("")) {
+    if (stack.top() === "(" && char === ")") {
+      stack.pop();
+    } else {
+      stack.push(char);
+    }
+  }
+
+  return stack.index === -1;
+}

1주차/채수혁/레벨2__같은_숫자는_싫어.js

@@ -0,0 +1,13 @@
+function solution(arr) {
+  var answer = [];
+
+  for (let i = 0; i < arr.length; i++) {
+    if (arr[i] === answer[answer.length === 0 ? 0 : answer.length - 1]) {
+      continue;
+    } else {
+      answer.push(arr[i]);
+    }
+  }
+
+  return answer;
+}